KR920008736B1 - Stencil apparatus - Google Patents

Abstract

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Description

Template

1A is a perspective view of a deposition apparatus constructed in accordance with the principles of the present invention.

FIG. 1B is an enlarged partial perspective view showing the cutout shown in FIG. 1A. FIG.

FIG. 2 is a perspective view showing a modification of the apparatus shown in FIG. 1A.

* Explanation of symbols on the main parts of the drawings

12: deposition means 20: storage belt

25 support means 26 template means

28: screen frame 36: channel

38: wire mesh screen 40: upper overlapping material

40A: Lower overlap material 42: Cutout

82: lower support plate 150: peripheral spacer

160: isolation element 170: spacer element

The present invention relates to an apparatus for depositing a form of the meltable powder on a receiving surface such that the meltable powder may subsequently be added to the substrate to change the particular reinforcing and strengthening or decorative properties of the substrate, and more particularly to shoes. A device for producing reinforcement or decorative means that can be applied to an upper before assembling the upper in the form of a shoe.

For many years, the footwear and apparel industry has installed reinforcement and reinforcement or decorative means in their products. Manufacturers of pajamas, jeans, sportswear and sports equipment (such as gloves, visors and soda) and shoe manufacturers have applied layers of reinforcement to their products by sealing, welding, or otherwise. There are various). In the footwear manufacturing industry, it is common to add reinforcement and reinforcement means or decorative means in layers of molten thermoplastic material that can stick to the upper of a shoe. The first attempt to reinforce or strengthen the upper of a shoe is to insert a preformed reinforcing enzyme into the upper of the shoe prior to assembly in the mold. A preferred form, wherein a separate molten plate material, which may be flexible by heat or solvent, is inserted into the upper of the shoe prior to assembly in the mold and then hardened before removing the upper of the shoe from the mold. It is molded during assembly in the furnace mold. Soaking the shoe components with a solution dispersion in a volatile liquid carrier of a hardenable reinforcing material before assembling the upper of the shoe and curing the soaked material after assembling the shoe in the mold can also strengthen the upper of the shoe. have.

One way to harden the upper of a shoe is described in US Pat. No. 3,316,573, whereby an elastically flexible reinforcing element is fluidly deposited and heated to the melting point and then cooled to a three-dimensional form. A selected portion intended to have is formed on the upper of the shoe.

Another device for coating a part of a shoe is described in US Pat. No. 3,342,624, which places a template on a shoe upper and supports the combination of the template and the shoe upper with a concave support surface, followed by a wiper blade. A wiper blade is used to sweep the template to deposit a liquid reinforcement in the depression of the shoe upper.

The most recent device for strengthening the components of a shoe is described in US Pat. No. 3,973,285, which deposits a molten thermoplastic charge on the upper of a shoe supported by an end fastening means.

Conventional devices as described above work well in some cases, but sometimes molten material flows out of the connection, requires time and patience for nozzles to leak or change patterns, and also No matter how much pressure is applied after application or cooling, the final shape of the reinforcement may not be as smooth as desired because the nozzle release pattern remains the same. Materials that can be used in these conventional machines are limited by their flow and thermal stability properties and therefore need to be carefully selected for their respective applications. Sealed or superimposed patterns also hindered the smooth application of the material, and it turned out that uneven surfaces were difficult for the device to support.

Therefore, an object of the present invention is to provide a template applicator (Stencil appartus) that can overcome the disadvantages of the prior art as described above.

It is another object of the present invention to easily manufacture reinforcement and reinforcement means or decorative means in a preferred form as an individual part of a substrate, such as, for example, an upper of a shoe or a part of a garment kind of material, which forms a cheap tool. It is intended to provide a mechanism that allows a wide range of arbitrary choices from cheap polymeric materials with good physical properties that can easily alter the pattern or style of various shoe uppers or the conditions of reinforcement and strengthening of clothing or decorative conditions. .

Still another object of the present invention is to provide a means for allowing the manufacture of the upper of a shoe that is soft yet reinforced and reinforced without the inconvenience of the prior art.

According to the invention, there is provided an apparatus for the subsequent treatment of a substrate and the deposition of powder material which can be applied to the substrate in a three-dimensional form on the receiving surface, wherein the powder material can adhere to the underside of the shoe upper. It is preferably a reinforcing and reinforcing and / or decorative powder. The device has a deposit, which has a horizontal storage belt in the shape of a square. The receiving belt is tensionably mounted on a frame that is movable to a continuous work piece. This storage belt serves as a support surface, and is a thin metal screen or a web of woven glass fiber coated with a low friction plastic heat resistant material. Deposition means comprising a template means in the form of a template is hingedly arranged on the upper portion of the receiving belt. The template means form the bottom of the deposition means constituting a container for receiving powder reinforcement and reinforcement and / or decorative material from a conduit attached to a feeder located at the top. The conduit may be arranged with a pair of wiper blades supported on a dispensing and conveyer that is movable in a direction across the vessel.

The template means slidably received at the bottom of the container is made of a wire mesh screen, a top pad of soft impermeable material and a bottom pad of thin film material. In a wire mesh screen, the mesh size is such that the powder is sufficient to pass through. Although the size of the powder used for most shoes is preferably 35 mesh, finer powders (i.e. 50 mesh to 100 mesh powders) are required for more complex designs. The powder can be melted by heating it to a temperature of about 375 ° F. (190.6 ° C.) to about 500 ° F. (260.0 ° C.) for about 25 seconds. Each of the soft and impervious top pad and the bottom pad of the thin film material has at least one cut out powder material in a consistent position (in the preferred embodiment this powder material is the upper or other substrate of the shoe). It is formed in the transverse direction so as to suit the desired overall shape of the reinforcement and reinforcement or decoration means that is a meltable powder to be added to.

A peripheral spacer, that is, a gasket, is disposed around at least a portion of the cutout formed in the metal foil portion on the screen side of the bottom of the template. The thickness portion at the end of the peripheral spacer is tapered, so that the middle portion of the peripheral spacer is thicker. In other words, when a tapered product is required, the peripheral spacers may be made thinner so that both ends of the spacer appear as dots when viewed from the side. In other embodiments, it may include a peripheral gasket or barrier having a uniform thickness at least around the cutout or having a uniform thickness over the entire perimeter of the cutout. The latter implementation may be applied to reinforcement and reinforcement or decorative means having a uniform thickness in the transverse direction of the entire object.

On the bottom of the template a number of isolation elements may be spaced apart from the cutout. This isolation element is a button-shaped member with a specific thickness, which allows air to flow between the film and the receiving surface located on the bottom of the screen on the template when the template is lifted from the receiving surface. The vortex of air is pushed into the vacuum part, which prevents the powder from being entangled on the receiving surface.

When the storage belt is disposed in the deposition unit, the lower support means which can be moved up and down with respect to the storage belt is located at the lower part of the storage belt, and thus, the powder is applied to the storage belt during the deposition process. Will be supported. The lower support means are plate-shaped and may have a wedge-shaped partition thereon which deflects the receiving surface between the cutout and the isolation element in the case of a partial peripheral gasket around the template means. By forming a skew on the product, it can be applied as an excellent reinforcement part of a shoe upper.

In the operation of the template device, a certain amount of the meltable powder received from the feeder is stored into the container from the dispenser and the conveyer. The wiper blade can sweep over the lower surface of the container in the template device, whereby the molten powder is pushed to some form of cutout, whereby the receiving belt is driven around the cutout of the bottom of the means by the lower support means thereunder. The spacer means are pushed so as to be in close contact with the gasket arrangement. Thus, a three-dimensional melt powder can be deposited on the receiving belt, which acts as a barrier for supporting (holding) the powder, and the portion of the peripheral gasket in the cutout on the screen of the template. Predetermined thickness and / or taper by spacers which serve to isolate a certain thickness from the receiving belt by a predetermined thickness (the thickness in the final product can be teared off by taper formed in the thickness of the peripheral spacer or gasket). Can be applied as

Upon receiving the appropriate signal, the lower support means (with this wedge, if there are wedges) under the receiving belt move downwards, and the pneumatically actuated cam strikes the cam follower so that the lower surface of the template means and the container It is slowly lifted from above, so that the three-dimensional powder already deposited has no contact with the template means or the isolation means. Since the template means is already lifted and supported from the receiving belt by the peripheral interceptor and the isolation element in the form of a button, the powder on the receiving belt is not entangled by air inflow as in the prior art. In order to further process the form of the powder after the processing by the template device, the form of powder placed thereon and the powder placed thereon is moved to the next working position by starting the pressure in the shuttle means by a separate appropriate signal. The surface can be appropriately heated and melted, cooled and pressed.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In Figures 1a and 1b, the template means 26 is shown enlarged, and the template means 26 in the form of a template are arranged on the receiving belt 20 and attached to the support means 25. It forms part of the deposition means 12. A powder material is stored in the template means 26 constituting the bottom of the screen frame 28, which is swept away from the bottom of the screen frame 28 by a wiper blade that is segmentally connected to a mobile carrier. Can be transferred. These powders can be, for example, polymers such as ionomers, polyethylene, ethylene vinyl acetate, polyvinyl chloride, or nylon, with a size of 25 mesh for the front of the shoe, from 50 mesh for finer patterns and thinner products. It is typical to produce a size of 100 mesh, but it is not necessarily limited to the polymer in the material.

The template means 26 retained in the channel 36 are a wire mesh screen 38, a top rug 40 made of a soft, rigid, impermeable plastic material on the top of the screen 38, and the screen ( And the upper rug 40 and the metal thin film 40A on the screen 38 by an adhesive coating located on a common surface with the screen 38. Can stick together. That is, the screen 38 is sandwiched between two layers of impermeable material, and in each layer, the screen facing the screen has a pressure-sensitive adhesive to hold the screen 38 and at the same time the screen ( It may be possible to grip each other through the eye of 38). A cutout 42 is formed through the upper pad of the soft plastic material and the lower pad of the metal thin film (but the screen 38 has no cutout), and this cutout is included in the accompanying drawings of the present invention. 42 is shown to be approximately semicircular. The size of the mesh in the screen 38 is adapted to allow the powder to flow freely.

At least a portion of the periphery of the cutout 42 on the lower thin film side of the screen 38 may be provided with a peripheral spacer 150 in the form of a gasket. The peripheral spacer 150 may have a specific thickness TH1 (FIG. 1a) at a specific location (center portion, if shown). The thickness TH2 at any position other than the central portion of the peripheral spacer 150 is thinner than the thickness TH1 of the central portion. This peripheral spacer can also be made to have a thinner TH3 at its end, or taper in the form of dots. The peripheral spacer 150 serves as a wall or partition to allow the powder to be pushed out better in the form of C through the cutout 42. This peripheral spacer 150 also allows the powder to be applied at a specific location around the cutout 42 at a specific thickness TH1, TH2, TH3, etc., thus allowing the thickness of the applied powder to taper thinner and thinner. Thus, when the wedge (indicated by ＂S＂ in the figure) on the lower support plate 82 is used, the end portion (not shown in the figure) is along the portion of the cutout portion 42 without the peripheral spacer 150 at all. E), otherwise the template spacer 26 will not reach the surface of the receiving belt by the peripheral spacer 150. Depending on the desired thickness and taper of the molten powder product to be applied to the substrate or shoebox, the desired thickness at each portion of the peripheral spacer 150 is determined. In other cases, if it is desired to give a uniform thickness to the final product, the thickness of the peripheral spacer 150 may be uniformed over its entire length, and the peripheral spacer may be disposed around the entire cutout.

On the metal thin film under the screen 38, a plurality of isolation elements 160 are spaced apart from each other at a distance from the periphery of the cutout 42, preferably from a cutout portion where there is no peripheral spacer 150. Can be arranged (see also FIG. 1A). This isolating element 160 is provided at any place on the bottom of the template means 26 at intervals from the cutouts 42, so as to prevent the formation of a vacuum in that portion. The isolation element 160 may have the form of a button made of rubber or plastic, and is formed on the upper surface of the accommodation belt 20 by forming a gap between the bottom surface of the template means 26 and the storage belt and between the isolation elements. Even after lifting up the template means 26 from the receiving belt 20 after forming the powder form (indicated by ＂C＂ in the figure), the air is irregularly pushed in so as not to damage the form.

Another form of peripheral spacer 150 may be a plurality of individual spacers 170 surrounding at least a portion of cutout 42, as shown in FIG. 2. These individual spacer elements 170 may be of a similar shape, the thickness of which varies toward the end of the arrangement, or may each have the same thickness throughout the perimeter of the cutout. This is a preferred arrangement when the form of powder (의 C ＂) is applied to the reinforcement of the collar or other form of clothing. In addition, if the powder form is to be used for a collar or the like, it is not necessary to make the cut portion as shown in the figure, but may be in any other suitable form in accordance with the shape of the substrate or the requirements thereof. And, the thickness of the individual spacer elements 170 may be determined to match the thickness of the peripheral spacer 150 at a suitable location around the cutout 42.

Therefore, even if the template means 20 is gradually lifted from the receiving belt 20 in which the three-dimensional powder form (＂C 을) is formed, the air channel already existing between the adjacent isolation elements 160 is removed. Since the air flows regularly through the air, the air is not pushed in and the powder is not broken. Thereafter, the powder is moved on a storage surface with a small thermal mass and directed to a subsequent working position, thereby undergoing a process such as heating, melting, melting, and bonding required for the substrate.

In the use of the template means for producing the reinforcement and reinforcement means or the decorative means to be used for the substrate (especially the upper part of the shoe), the specific powder and device properties will be illustrated by the following examples.

Example A

This embodiment is an embodiment in which the present invention is preferably used for reinforcing or reinforcing shoe uppers. The following properties were used: 30 to 50 mesh ionomer powders in the form of sodium cations with a melt index of 2.5, a bending rate of 51,000 psi, a thermal softening temperature (Vicat) of 63 ° C., and no additives. . Cutouts, flat and underlays in flat surfaces were made in specific shapes as needed and placed on 8 mesh screens made of 0.015 inch (0.38 mm) stainless steel wire. Using 8 mesh screens, we can balance the corresponding elements such as (a)-(c) below. That is, (a) the use of fine mesh makes the wiper blade smooth. (b) If the screen wire is too thick, the end, i.e. the tapered end, is too thick. (c) The use of small diameter coarse wires causes the remaining powder particles to stick or jam, resulting in a small surface area.

As spacer means at the bottom of the template, one for a molten product having a thickness of about 0.040 inch (1.02 mm) was used. In consideration of the bulk density and the flow action of the powder, a peripheral gasket having a thickness of 0.100 inch (2.54 mm) was used on the bottom of the template means. By adjusting the above-mentioned wedge on the lower support surface, the part without spacer means in the receiving belt is deformed so as not to touch the bottom surface of the template means, whereby the receiving belt is in the range of the surrounding gasket. Appropriate, i.e., the desired taper, was formed to the powder added to.

After the powder was produced by the template, the powder was transferred to a heating section, with the lower heater set to about 490 ° F. (254.4 ° C.). Each exothermic heater on top of the receiving belt was adjusted to have a surface temperature of approximately 600 ° F. (315.6 ° C.).

The deposition apparatus was operated so that the total time to melt the powder on the receiving belt was about 25 seconds, during which time the product was transferred to the final stage to apply it to the substrate (in this case, the bottom of the shoe upper). The cooling plate was cooled while pressing.

The final part of the shoe upper of the shoe upper was 0.012 inches (0.30 mm) thick at its ends and 0.035 inches (0.89 mm) thick at its maximum thickness.

Example B

In this embodiment, as another embodiment for use with a template device, in this embodiment, 0.3% polyalkoxy tertiary amine as antistatic agent, and 0.3 as desiccant and flow promoter. By using% fine silica as an additive in the powder, less residual powder remains on the screen during the deposition process and reduced the electrostatic movement of the powder particles, while at the same time obtaining an advanced print pattern. In this case, the product may have a thickness of 0.040 inch (1.02 mm) at the maximum thickness portion.

Example C

In this example, 0.05% of conductive flue soot was included as an additive in the preferred composition in Example A above. The deposition, flow and product pattern at this time were similar to those in Example B. The melting time in the heating section was reduced to about 20 seconds and the product thickness was about 0.040 inches (1.02 mm).

Example D

To manufacture soluble shoe fronts for new or ladies shoes, a low-density 35-mesh polyethylene powder with a melt index of 22, a flexion rate of 19,000 psi, a thermal softening temperature (becket) of 83 ° C and no additives is used. It was. The lower heating block raised the temperature to about 400 ° F. (204.4 ° C.) and the upper heating element was about 500 ° C. (260.0 ° C.), and the thickness was about 0.012 when the heating (melting) time was about 18 seconds. Tapered products were made from inches (0.30 mm) to 0.035 inches (0.89 mm).

Example E

To prepare soft shoe fronts for slippers, ladies shoes and some children's shoes, 35 mesh ethylene vinyl acetate copolymers were used having a melt index of 9, a flexure of about 13,500 psi and a thermal degradation temperature of about 59 ° C. The conditions of the machine were the same as in Example D, and a tapered product having a thickness of about 0.012 inch (0.30 mm) to 0.035 inch (0.89 mm) was prepared by setting the heating (melting) time to 12 seconds.

Example F

If the device is intended to reinforce the neck, the strap or upper line portion of the shoe upper, 100 mesh nylon 12 and 0.3% polyalkoxy tertiary amine are preferred powders. The mesh size of the template screen may be about 30 mesh. Since the product is not tapered at this time, the gasket at this time is formed around the cutout and has a uniform thickness and is in the form of a dot-shaped spacer having a thickness of 0.040 inch (1.02 mm) (see Fig. 2). Using the same mechanical conditions as in the above, the heating time was 12 seconds to obtain a printed pattern having a thickness of 0.017 inch (0.43 mm).

Example G

This example relates to the reinforcement of a thin film form similar to that of Example F, in which 100 mesh vinyl powder and 0.3% polyalkoxy tertiary amine powder are used, and if necessary, a heat stabilizer is added. Using the same deposition means and conditions yields the same results.

Claims (10)

An apparatus for depositing a powder material on a surface of a receiving belt in a desired three-dimensional shape, comprising: a screen arrangement including a layer of an impermeable material having a cutout, wherein the powder material passes through the cutout to The cutout portion deposited on the receiving surface corresponds to the desired planar shape suitable for the shape in which the powder material is thus deposited, and the spacer means provided on the underside of the screen arrangement maintains the screen arrangement spaced apart from the receiving surface. And a template having a desired three-dimensional shape together with the housing surface to receive the powder material when deposited on the housing surface as described above. 2. The template apparatus according to claim 1, wherein the spacer means is disposed around a cutout formed in the impermeable layer. The template device according to claim 2, wherein the thickness of the spacer means is not constant. 4. The template apparatus according to claim 3, wherein the spacer means extends only about a portion around the cutout, and is thickest and tapered toward both ends at an intermediate point of the spacer means. 5. The receiving surface of claim 4, wherein the receiving surface is made of a flexible sheet material, and means for deforming the receiving surface during deposition of the powder material are disposed below the receiving surface, wherein the deforming means is in an area abutted by the spacer means. A template device arranged to abut against the bottom of the receiving surface in the spaced apart storage surface area and to push the receiving surface against the bottom of the screen arrangement within the abutted area. 6. The template apparatus according to claim 5, wherein the deforming means is constituted by a wedge, and a means for pushing the wedge against the bottom surface of the receiving surface is provided. 7. A method according to any one of claims 4 to 6, wherein a plurality of isolation elements spaced apart from the cutout and capable of abutting the receiving surface are arranged on the underside of the screen arrangement so as to lift the screen arrangement therebetween. The template device to prevent the powder material deposited as described above from being entangled due to the high speed air passing through. The template device according to any one of claims 1 to 6, wherein the spacer means comprises a gasket member. 7. The template device according to any one of the preceding claims, wherein the spacer means consists of a plurality of individual spacer elements. 7. The screen of any of claims 1-6, wherein the screen arrangement further comprises a wire mesh screen and another thin film layer in addition to the layer of impermeable material, the thin film corresponding to a cutout formed in the layer of impermeable material. And a cutout, wherein the screen is sandwiched between the layer and the thin film.

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